A new cobalt complex, bis­[tris­(amino­thio­urea)cobalt(III)] bis­[2-(carb­oxy­methyl)-2-hy­droxy­butane­dioato]cobalt(II) tetra­nitrate tetra­hydrate, [Co(CH5N3S)3][Co(C6H6O7)2]0.5(NO3)2·2H2O, designated as [Co(tsc)3]2[Co(cit)2](NO3)4·4H2O, was synthesized. Two crystallographically independent cobalt centers are present. In the first, the central metal atom is chelated by three thio­semicarbazide ligands in a bidentate fashion whereas the second, positioned on a crystallographic inversion center, is hexa­coordinated by two citrate anions in a distorted octa­hedral geometry. Additionally, two water mol­ecules and two nitrate anions are present in the asymmetric unit. Hirshfeld surface analysis revealed that the presence of numerous donor and acceptor groups in the complex, which facilitate hydrogen-bonding inter­actions that contribute significantly to the overall cohesion of the crystal structure.

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